Improvement in harness mechanisms for looms



J-. M. BROWN. Harness Mechanism for Looms.

No. 221,662 Patented Nov. 18, 1879.

Jul-Ir WITNESSES; [N VENTOR ATTORNEY MFEYERS, PHOTOJJTHDGRAPHER, WASHINGTON- D. C. I

UNITED STATES PATENT OEEIOE.

JOHN M. BROWN, OF SNVARTHMORE, PENNSYLVANIA.

IMPROVEMENT lN HARNESS MECHANISMS FOR LOOlViS.

Specification forming part of Letters Patent No. 221,662, dated November 18, 1879; application filed July 7,1879.

To all whom it may concern:

Be it known thatI, JOHN MORTON BROWN, of Swarthmorc, in the county of Delaware and State of Pennsylvania, have invented certain new and useful Improvements in Harness Mechanisms for Looms, which improvements are fully set forth in the following specification, reference being had to the accompanying drawings, in which- Figure 1 is a front view of the device, showing its connection with other parts of the loom. Fig. 2 is a side view of the same and Figs. 3, 4, 5, and 6 show the essential parts in detail.

Harness mechanism may be divided into three great classes, namely: first, those in which the harness-frames are moved with a positive motion in closing as well as in opening the shed; second, those which act upon the shed positively when it opens, but not when it closes, the latter operation being performed by Weights or springs and, third, those harness mechanisms in which the positive motion imparted to one or more harness-frames has the effect of moving the rest of the harnessframes in the opposite direction.

This third class, and to which my invention relates, is provided, in addition to the harnessoperating mechanism proper, with an equalizin g device, consisting either of one or more rollers having their axes parallel with the harnessframes, of a series of levers to which the harness-frames are connected, or of a system of movable and stationary pulleys over which a cord passes in successive convolutions, as indicated in Figs. 1 and 2 in the annexed drawings.

The object of my invention is to furnish a more convenient and durable means of connectin g the harness-frames with the equalizing device by interposing a bar, which does away with the cords, straps, and other easily-destroyed connections heretofore in use, and at the same time acts, in combination with its guide, as a stop to limit the vertical movement of the heddles. The guide for the bars also performs another functionnamely, that of keeping the heddle-frames at proper distance from each other, and also steadies them in theirvertical motion. By constructing the bar and guide thus, and by combining the two in such a manner that each performs several functions, great economy is attained, while at the same time durability and perfect action of the heddles are secured.

In the accompanying drawings the equalizing device heretofore mentioned is represented by the series of pulleys J, which have their axes stationary, and the series 0, whose axes are movable. A cord, L, passes alternately and successively over a pulley in the series J and over one in the series 0 until as many movable pulleys hang suspended in the loops of the cord L as thereare heddle-frames, when one loose end of the cord L is fastened to the tension device M, which serves to regulate the length of the loops for the pulleys 0, and the other at J, Fig. 1.

It is evident that so long as the number of descending heddle-frames is equal to the number of those which ascend at the same time, and so long as the amount of vertical motion of these heddle-frames is equal, the tension device M is neutral, and does not perform any function but that of supporting one end of the cord L, because the length of the cord given up by the shortening of the loops of the ascendingheddle-frames is equal to that required for the elongation of the loops of the descending heddle-frames, and therefore the end of the cord attached to M may remain stationary. When, however, the number of the ascending heddle frames does not equal that of the descendin g frames, or when the amountof motion of the heddle-frames in one direction is not equal to that of the heddle-frames which move in the opposite direction at the same time, then the difference in the length of the cord L required for that purpose has to be given up or taken up by the motion of the tension device M. A weight or a spring is usually employed to act upon the tension device for that purpose.

Between the movable pulleys O of the equal izing device just described and the heddleframes H, which are both old devices, Iinterpose the barB, Figs. 1, 2, 3, and 4, primarily for the purpose of securin g a ready and convenient method for connecting and disconnecting the equalizing, device and the heddle- I farther they hang from the front of the loom, frames 11. For this end the bar B is provided In order that all the warp-threads may have, at one end with a hook, which may be readily when the shed is open, the same angle, whose introduced into the eye of the frame of the vertex isat the point where thecloth is formed. pulley 0. An eye upon the opposite end of In order to secure this graduation in the the bar B serves to attach it to the heddle- I height to which the heddle-frames are to be frame II. raised,I provide thelowersnrface of the guide For the purpose of limiting the upward mo- A with steps F F F, of which the one nearest tion of the bar I; and heddle-t'rame II, the bar the frame of the loom, and the farthest one B is provided with shoulders (1, which come from the front, permits the harnessframes to in contact with theside F of the guide A, Figs. rise the highest.

1, 2, 5, and 6, when the bar B has arrived at What 1 claim as my invention, and desire the uppermost limit of its motion. to secure by Letters Patent, is-

The guide A, through whichtheharsBpass, The combination of the bars B, provided secures to the latter a steady, vertical, rectiwith the hook D and shoulders G, with the linear motion, which is also transmitted to the guide A, having, a graduated surface, F F F, attached hethlle-trames II. and recesses E E E, acting and operating with In order to keep the heddleframes their the pulleys O, pulleys J, and mechanism for proper distance from each other, the interior operating the harness or heddle frames H II of the guide A is provided with recesses E E I], substantially as and for the purpose set wide enough to admit the bars l,said recesses forth.

being made such a distance from each other JOHN MORTON BROWN. as is desired in the heddle't'rames li. \Vitnesses:

It is customary to give to the heddletrames IROSBY M. BROWN,

:1 graduallyiiIcreased amount of motion the NEWBOLI) R. HAINES. 

